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11D. SKBBL. MILLING ATTACHMENT POR LA'IIHBS.v No. 478,244. 'PatentedJuly A5, 1892.

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FRANK D. sKEEL, oF NEW YORK, N. Y.

MILLING ATTACHMENI FOR' LATHES.

SPECIFICATION forming part of Letters Patent No. 478,244, dated July 5,1892. Application filed November *2 5,18'91. Serial No. 413,039. (Nomodel.)

To all whom it may concern:

Be it known that I, FRANK D. SKEEL, a citizen of the United States,vresiding at New York, in the county and State of IN ew York, haveinvented certain new and usefull Im provements in Milling Attachmentsfor Lathes, of which the following is a specification, reference beinghad to the drawings accompanying and forming a part'of the same.

This invention relates to devices to be used on the cross-feedslide-rest ot` a lathe in place of the tool-holder which is commonlyemployed and which is moved in opposite directions transversely to thevmain feed or slides. i

The device or attachment is in the nature of a table or face-plate towhich the work or part to be ont or milled is to be attached, and it isconstructed with a viewI to its angular and vertical adjustmentrelatively to the lathe-centers, so that work of varying and irregularcharacter may be done with the ordinary lathe.

The improvement in such devices which I have made the subject of thisspecification involves the use ot' a hollow cylindrical part or baseprovided with a dovetail groove to tit the cross-slide, to which base issecured a suitable socket or nut for engagement with the cross-feedscrew. The interior ot' said cylinder-base is threaded, and a ring isinserted therein which supports a face-plate or bed, to which thematerial to be operated upon by the milling tool or cutter which iscarried on a mandrel between the lathe-centers is secured. Acrossthefbottom of the said ring extends a bridge with a space beneath it forcontaining a nut that engages with a screw-stem or projectionextendingfrom the under side of the Jface-plate through a perforation inthe bridge.

bridge,.whereby it will bear upon the upper side of the nut and Vbindthe face-plate firmly` A suitable de-l vice is provided for depressingone end of the tion which l have devised are illustrated in theaccompanying drawings.

Figure l is a view in elevation of a portion of aA lathe with myimprovements attached, the shears being shown in section. Fig. 2 is aview in elevation and part vertical central section of thedevice inposition on the lathe. Fig. 3 is a plan view of the same. Fig. 4 is acentral vertical section of the attachment 'with the addition of adevice for preventing the rotation of the face-plate relatively tothebase. Fig. 5 is a plan view ot' Fig. 4. Fig. 6 is a plan view of a'modification of the base and ring. Fig. 7 is a central vertical sectionof the same. v d l Fig. l shows portions of van ordinary metalworking orsiinilar'lathe, in which- Ais thecrank for regulating the longitudinalfeed,and A that for the cross-feed of the usual tool-holder.

B B are the shears or bed upon which the head-stock or puppets slide.

B is the dovetail guide upon which the slide-rest moves transversely.

O- is a hollow cylindrical base or socket closed at the bottom, acrosswhich is cut a dovetail'groove C for the reception of the guide B.Attached by screws c or otherwise to the base C is a threaded socket ornut D, with which the cross-screw D engages. The upper portion of thecylindrical base C is split and provided with lugs E, which by means ofa screw E" may be drawn together to clamp or bind the parts inserted inthe base, as hereinafter described. The interior of the base C isthreaded, and screwing into it is a ring F, which forms a socket orbearing for a face-plate or bed F', which is provided with the usualgrooves or holes for the devices by which the material to be operated onis secured in position. When screwed down, this ring should be flushwith the edge of the lbase C, the upper surface of the faceplate beingslightly above the upper edge of the base.

G is anv arched bridge-piece that extends across the bottom ofthethreaded ring F.- The ends of this bridge lie in recesses cut in thelower edges of the said ring and are i'lush with its lower side. Thebridge is curved so as to leave space for a nut H below it, the

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bottom of which is also flush with the lower edge of the ring. From thecenter ot the under side ot the face-plate F a threaded stemfextendsdownward through an opening in the bridge and engages with the nut. Ahole is tapped in one side ot' the ring F, extending down through thesame to the recess in which one end of the bridge lies. A screw g isfitted into this hole, and when tightened forces the end of the bridgedown upon the nut with a lever action, which in turn holds theface-platedown in its seat and binds it iirmly to the ring F. By turning the ringin the base C the vertical adjustment of the face-plate is obtained, andafter its adjustment it is lixed in position by turning the screw E toclamp the split portion of thebase C and the ring F together. Theface-plate may, of course, be revolved through any angle after thedesired height is obtained, after which the parts may be clampedtogether. This construction is a very desirable one on account of itssimplicity and strength and the freedom from all vibration which itsecures.

It will readily be understood that by cutting the threads of the ring ona predetermined basis a given rotary movement of the ring will yield agiven vertical movement of the face-plate. I have also devised a meansfor preventing the rotation ot' the lace-plate while the ring is beingturned for its vertical adjustment. This is shown in Figs. et and 5. AV-shaped groove is cut in the edge of the face-plate F', and lying inthis groove is a thin ring K. This ring is split and provided with lugsheld together by a clam ping-screw L. Projecting downward from one ofthe lugs is a pin L', that ts into a hole drilled in the upper edge ot'the base C or into one of the lugs thereon. This pin slides in the holevertically as a vertical motion is imparted to the face-plate by therotation of the ring F.

In some cases it may be desirable to secure the face-plate or bed` inthe socket-ring in other ways than by the bridge-piece above described,and one way that I contemplate is to cut threads on the interior of thering F and on the sides of the bed or faceplate, as shown in Fig. 7, andscrew the latter into the threaded ring. In such cases the ringis splitin one or more places, as shown in Fig. 6, so that when the screwE ofthe outer base or socket is tightened the whole will be clamped tightlytogether. In this construction it would be advantageous to cut thethreads right and left. This and other wellunderstood means of securingthe face-plate to the base makes it an easy matter to transfer theface-plate or chuck of the lathe from its proper position to the socketin the ring F, by which means work already turned in the lathe may betransferred directly to the milling-table without being removed from itsfastenings, thus gaining in time and accu- 6 5 racy.

Having now described my inventiouand the best manner of which I am awarein which the saine is or maybe carried into elechwhat I now claim is--l. The combination, with the cross-slide and cross-feed mechanism of alathe, of a base engaged by the feed mechanism and running on the slideand formed orprovided with a split socket and means for contracting ortightening the same, a threaded ring engaging with the socket, aface-plate seated in or on said ring, and means for securingthefaceplate to said ring, substantially as herein described.

2. In a milling attachment for lathes, the combination, with thesocket-base engaged or adapted for engagement with the cross-feedmechanism, of the threaded ring` within the socket, which socket issplit and provided with a clamping-screw, a face-plate for which thering forms a seat, a bridge-piece across the under side of the ringengaging a nut on a stem extending downward from the under side of theface-plate, and a screw for depressing the bridge-piece and clampingorbinding the face-plate in its seat.

3. In a milling attachment for lathes, the combination of a base havinga feed movement transverse to the line of centers, a socket-ringengaging with the base by screwthreads, whereby it maybe adjustedangularly and vertically with respect thereto, a face-plate carried bysaid ring and capable of rotation therein, a detent for preventing therotation of the face-plate with respect to the base, and means forbinding or clamping together the face-plate and ring and the ring andbase, as herein set forth.

`-l-. In a milling attachment for lathes, the combination, with a basehaydng a feed movement transverse to the line of centers, the threadedring set therein, the face-plate, and means for clamping or binding itto the ring, of the split or clamping ring surrounding the face-plateand a pin or stud thereon entering a vertical hole lin the base, as andfor the purpose set forth.

5. In a milling attachment for lathes, the combination, with a basehaving a feed movement transverse to the line ot centers, of a threadedring set therein, a face-plate seated on the ring and formed with a stemextentiing downward from its under side, a bridge across the under sideof the ring through an opening in which the stem passes, a nut under thebridge and secured to the stem, anda screw passing down through the ringand adapted to depress one end of said bridge and clamp or bind theface-plate and ring together, as set forth.

FRANK D. SKEEL.

Witnesses:A

E. A. CARLEY, W. N. ROBERTSON.

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